Figure 1 | Scientific Reports

Figure 1

From: Rayleigh scatter based order of magnitude increase in distributed temperature and strain sensing by simple UV exposure of optical fibre

Figure 1

OFDR measurement done with a LUNA system,

as shown in (a) 20, at different region in the fibre with a wide scan (42 nm). Measurements show the measured round-trip signal amplitude of Rayleigh scatter (corresponds to the square of local losses). (b) A comparison of various types of structure and exposure in a standard SMF-28 fibre: uniform FBG, random FBG and continuous UV exposure (no FBG). (c) A comparison of SMF-28, with UV-exposed and un-exposed HNA fibre (HNA: High NA fibre with high Ge core). OFDR measurements of gratings were performed out-of-band (away from FBG operating wavelength).

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